Abstract
BackgroundThe aim of this study was to evaluate the influence of dentin pretreatment with NaOCl on shear bond strength of four one-step self-etch adhesives with different pH values.Material and MethodsBovine permanent incisors were used. Four one-step self-etch adhesives were tested: Adper™ Easy Bond, Futurabond NR, G-aenial Bond, Clearfil S3 Bond. One two-step self-etch adhesive (Clearfil SE Bond) was used as control. Group 1- no pretreatment; group 2- pretratment with 5,25 % NaOCl; group 3- pretreatment with 37 % H3PO4 etching and 5,25 % NaOCl. A hybrid composite resin was inserted into the dentin surface. The specimens were tested in a universal testing machine. The examiners evaluated the fractured surfaces in optical microscope to determine failure modes, quantified with adhesive remnant index (ARI).ResultsDentin pretreatment variably influenced bond strength values of the different adhesive systems. When no dentin pretreatment was applied, no significant differences were found (P >.05) among four adhesives tested. No significant differences were recorded when comparing NaOCl pretreatment with H3PO4 + NaOCl pretreatment for all adhesive tested (P >.05) except Clearfil S3 Bond that showed higher shear bond strength values when H3PO4 was applied. Frequencies of ARI scores were calculated.ConclusionsThe influence of dentin pretreatment with NaOCl depends on the composition of each adhesive system used. There was no difference in bond strength values among self-etch adhesives with different pH values. Key words:Dentin, pretreatment, self-etch adhesives.
Highlights
Modern adhesive systems are classified into etch-andrinse and self-etch adhesives [1]
When NaOCl pretreatment was conducted four adhesives tested (AdperTM Easy bond, Futurabond NR, Clearfil S3 Bond and Clearfil SE Bond) showed no significant differences in shear bond strength values when compared with untreated groups (P>.05), whereas when testing G-aenial Bond strength values were significantly lower than those recorded under untreated dentin (P
When H3PO4 + NaOCl pretreatment was tested three adhesives (AdperTM Easy bond, Futurabond NR and Clearfil SE Bond) showed no significant differences in shear bond strength values when compared with untreated groups (P >.05), whereas when testing G-aenial Bond strength values were significantly lower than those recorded under untreated dentin (P.05)
Summary
Colombo M, Beltrami R, Chiesa M, Poggio C, Scribante A. Shear bond strength of one-step self-etch adhesives to dentin: Evaluation of NaOCl pretreatment.
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